import { Metadata } from 'next';
import { notFound } from 'next/navigation';
import Link from 'next/link';
import { ArrowLeft } from 'lucide-react';

type TutorialContent = {
  title: string;
  description: string;
  keywords: string;
  content: string;
};

const tutorials: Record<string, TutorialContent> = {
  'beginners-guide': {
    title: 'Beginner\'s Guide to Sudoku 2025',
    description: 'Complete beginner\'s guide to Sudoku. Learn rules, basic strategies, and start solving puzzles today.',
    keywords: 'sudoku for beginners, how to play sudoku, sudoku rules, sudoku basics 2025',
    content: `
# Beginner's Guide to Sudoku

## What is Sudoku?

Sudoku is a logic-based number puzzle that requires no mathematical skills. The objective is to fill a 9×9 grid with digits from 1 to 9 so that each column, each row, and each of the nine 3×3 subgrids (called "boxes" or "regions") contains all digits from 1 to 9 without repetition.

## The Basic Rules

Understanding the rules is the first step to mastering Sudoku:

1. **Grid Structure**: The puzzle consists of a 9×9 grid divided into nine 3×3 boxes
2. **Starting Numbers**: Some cells are pre-filled with numbers (called "givens")
3. **Row Rule**: Each row must contain the numbers 1-9 exactly once
4. **Column Rule**: Each column must contain the numbers 1-9 exactly once
5. **Box Rule**: Each 3×3 box must contain the numbers 1-9 exactly once

## Getting Started: Your First Puzzle

When you start a Sudoku puzzle, follow these steps:

### Step 1: Scan for Singles
Look for cells where only one number can fit. Start with rows, columns, or boxes that already have many numbers filled in.

### Step 2: Use the Process of Elimination
For each empty cell, determine which numbers are already used in its row, column, and box. The remaining numbers are candidates.

### Step 3: Look for Naked Singles
A "naked single" is when a cell can only contain one possible number. This is the easiest technique and should be your first approach.

### Step 4: Hidden Singles
Sometimes a number can only go in one place within a row, column, or box, even if that cell has other candidates. This is called a "hidden single."

## Common Beginner Strategies

### Scanning Technique
Systematically check each number (1-9) and see where it can fit in each box, row, or column.

### Cross-Hatching
Focus on one box at a time. Look at the numbers in adjacent boxes and rows to eliminate possibilities.

### Pencil Marks
Write small candidate numbers in empty cells. This helps track possibilities and spot patterns.

## Tips for Success

1. **Start Easy**: Begin with easy puzzles to build confidence
2. **Be Patient**: Don't guess—use logic to find each answer
3. **Take Breaks**: If you're stuck, step away and return with fresh eyes
4. **Practice Daily**: Consistency improves your skills faster than occasional long sessions
5. **Learn Patterns**: Over time, you'll recognize common patterns that speed up solving

## Common Mistakes to Avoid

- **Guessing**: Always use logic, never guess
- **Missing Duplicates**: Double-check your entries don't create duplicates
- **Rushing**: Take your time, especially when learning
- **Ignoring Patterns**: Look for recurring situations that indicate specific techniques

## Your First Puzzle Strategy

Here's a step-by-step approach for your first few puzzles:

1. Fill in all obvious numbers (naked singles)
2. Scan each row, column, and box for hidden singles
3. Use pencil marks if you get stuck
4. Revisit cells after filling in new numbers
5. Celebrate small victories—each correct number is progress

## Practice Makes Perfect

The key to becoming proficient at Sudoku is regular practice. Start with easy puzzles and gradually increase difficulty as you become more comfortable. Most beginners can solve easy puzzles within 10-15 minutes after learning the basics.

Remember: Sudoku is about pattern recognition and logical deduction. With practice, what seems complex now will become second nature. Every expert was once a beginner—keep practicing, and you'll see improvement quickly.

## Next Steps

Once you're comfortable with basic strategies, you're ready to explore intermediate techniques like:
- Candidate lines
- Double pairs
- X-Wing patterns

Keep playing, stay curious, and most importantly—have fun solving!
    `
  },
  'advanced-strategies': {
    title: 'Advanced Sudoku Strategies 2025',
    description: 'Master advanced Sudoku techniques including X-Wing, Swordfish, XY-Wing, and more. Take your solving skills to expert level.',
    keywords: 'advanced sudoku strategies, X-Wing technique, Swordfish sudoku, XY-Wing, sudoku expert tips 2025',
    content: `
# Advanced Sudoku Strategies

## Moving Beyond Basics

Once you've mastered basic Sudoku techniques, it's time to learn advanced strategies that will help you solve difficult puzzles. These techniques require pattern recognition and logical thinking at a higher level.

## X-Wing Pattern

The X-Wing is one of the most powerful intermediate-to-advanced techniques.

### What is an X-Wing?

An X-Wing occurs when a candidate number appears exactly twice in two different rows (or columns), and these appearances line up in the same two columns (or rows), forming a rectangle pattern.

### How to Use X-Wing

1. Identify a candidate that appears exactly twice in two different rows
2. Check if these occurrences are in the same two columns
3. Eliminate that candidate from all other cells in those two columns

This technique works because the candidate must occupy opposite corners of the rectangle, eliminating it from the rest of the columns.

## Swordfish Pattern

Swordfish is an extension of the X-Wing pattern but involves three rows and three columns instead of two.

### Identifying Swordfish

1. Find a candidate that appears 2-3 times in each of three rows
2. All occurrences must be confined to the same three columns
3. Eliminate the candidate from all other cells in those three columns

Swordfish is rarer than X-Wing but extremely effective when it appears.

## XY-Wing Strategy

XY-Wing is a powerful technique that uses three cells forming a chain of possibilities.

### How XY-Wing Works

1. Find a "pivot" cell with exactly two candidates (e.g., XY)
2. Find two "wing" cells that each share one candidate with the pivot (X and Y)
3. The wing cells form a pattern where any cell that sees both wings cannot contain the shared candidate

### Example Pattern
- Pivot: candidates 34
- Wing 1: candidates 35 (shares 3 with pivot)
- Wing 2: candidates 45 (shares 4 with pivot)
- Any cell seeing both wings cannot be 5

## Y-Wing and XYZ-Wing

These are variations of the XY-Wing technique with slightly different patterns.

### Y-Wing
Similar to XY-Wing but with a different logical chain. The principle remains: follow the candidate chains to eliminate possibilities.

### XYZ-Wing
Involves three cells where one cell contains three candidates (XYZ) and forms a specific pattern with two other cells.

## Coloring and Multi-Coloring

Coloring techniques use logical chains to eliminate candidates.

### Simple Coloring

1. Choose a candidate number
2. Pick a starting cell and color it (mentally or with pencil marks)
3. Follow the chain: cells that would prevent your colored cell from being true get the opposite color
4. Look for contradictions or eliminations

### Multi-Coloring

Extends simple coloring by using multiple colors and looking for interactions between different chains.

## Forcing Chains

Forcing chains is one of the most advanced techniques.

### How It Works

1. Assume a candidate is true in a specific cell
2. Follow the logical consequences through the puzzle
3. If all paths lead to the same conclusion, that conclusion must be true
4. If any path leads to a contradiction, eliminate that candidate

## Uniqueness Techniques

These strategies rely on the principle that valid Sudoku puzzles have only one solution.

### Unique Rectangle

When you spot a pattern that would create multiple solutions, you can use that to eliminate candidates that would cause the ambiguity.

### BUG (Bivalue Universal Grave)

When a puzzle is reduced to a state where every unsolved cell has exactly two candidates except one, that exception must be resolved in a specific way.

## Tips for Applying Advanced Techniques

1. **Master Prerequisites**: Ensure you're comfortable with basic techniques first
2. **Look for Patterns**: Advanced techniques often reveal themselves as patterns
3. **Stay Organized**: Use pencil marks systematically
4. **Practice Recognition**: The more you practice, the faster you'll spot these patterns
5. **Don't Force It**: If an advanced technique isn't obvious, return to simpler methods

## When to Use Advanced Strategies

- Use basic techniques first—they're faster and more common
- Only employ advanced strategies when simpler methods are exhausted
- Some puzzles can be solved entirely with basic techniques
- Hard and expert puzzles typically require at least one advanced technique

## Building Your Skill Set

To master advanced strategies:

1. **Study Examples**: Look at solved examples of each technique
2. **Practice Specifically**: Use puzzles designed to practice specific techniques
3. **Be Patient**: These techniques take time to recognize naturally
4. **Keep Notes**: Document patterns you discover
5. **Join Communities**: Discuss strategies with other enthusiasts

## The Path to Expertise

Advanced strategies separate casual players from experts. While they seem complex initially, with practice, you'll start recognizing these patterns quickly. The key is consistent practice and approaching each puzzle methodically.

Remember: Even experts don't use every advanced technique in every puzzle. The art is knowing which tool to use when. Start with one or two advanced techniques, master them, then gradually expand your toolkit.

## Conclusion

Advanced Sudoku strategies transform challenging puzzles from impossible to solvable. They require patience to learn but are incredibly rewarding to master. As you practice these techniques, you'll develop intuition for spotting patterns and choosing the right strategy at the right time.

Keep challenging yourself with harder puzzles, and don't be discouraged if progress feels slow. Every expert was once where you are now—persistent practice is the path to mastery.
    `
  },
  'common-mistakes': {
    title: 'Common Sudoku Mistakes to Avoid',
    description: 'Learn the most common Sudoku mistakes beginners make and how to avoid them. Improve your accuracy and solve puzzles faster.',
    keywords: 'sudoku mistakes, sudoku errors, sudoku tips, how to improve at sudoku 2025',
    content: `
# Common Sudoku Mistakes to Avoid

## Introduction

Even experienced Sudoku players make mistakes. Understanding common errors helps you avoid frustration and improve your solving speed. This guide covers the most frequent mistakes and how to prevent them.

## Mistake #1: Guessing Instead of Using Logic

### The Problem
Many beginners, when stuck, start guessing numbers rather than using logical deduction. Guessing often leads to errors that aren't immediately obvious but create problems later.

### The Solution
- Always use logic to determine each number
- If you can't find a logical move, use pencil marks to track candidates
- Take a break if you're truly stuck rather than guessing
- Remember: every valid Sudoku has a logical solution path

### Prevention Tips
- Practice identifying different solving techniques
- Keep a mental checklist of strategies to try
- Use the process of elimination systematically

## Mistake #2: Creating Duplicate Numbers

### The Problem
Accidentally placing the same number twice in a row, column, or box is the most common error. This often happens when you're moving quickly or not checking thoroughly.

### The Solution
- Before placing a number, verify the entire row, column, and box
- Develop a systematic checking routine
- Use pencil marks to prevent duplicates
- After placing a number, immediately check for conflicts

### Prevention Tips
- Slow down—speed comes with practice
- Check horizontally, vertically, and within the box
- Use visual scanning techniques
- Keep your workspace organized

## Mistake #3: Forgetting to Update Pencil Marks

### The Problem
When you fill in a number, it affects the candidates in related cells. Failing to update pencil marks leads to incorrect deductions later.

### The Solution
- After filling any number, immediately update affected pencil marks
- Remove that number from all cells in the same row, column, and box
- Re-evaluate cells that now have fewer candidates
- Make updating pencil marks automatic habit

### Prevention Tips
- Use a systematic approach to updating
- Check each affected cell methodically
- Consider using digital tools that auto-update
- Practice patience—thorough work prevents mistakes

## Mistake #4: Tunnel Vision on One Area

### The Problem
Focusing too intensely on one section of the puzzle while missing easier opportunities elsewhere.

### The Solution
- Regularly scan the entire puzzle
- Work on multiple areas simultaneously
- When stuck in one area, switch to another
- Look for the easiest solve, not the closest

### Prevention Tips
- Develop a scanning routine covering the whole puzzle
- Set a rule: if stuck for 2 minutes, move to a different area
- Practice expanding your awareness
- Train yourself to spot obvious moves anywhere

## Mistake #5: Misidentifying Techniques

### The Problem
Applying the wrong technique to a situation, or thinking you've found a pattern when you haven't.

### The Solution
- Study each technique thoroughly before using it
- Verify the pattern completely before eliminating candidates
- Double-check your logic
- When in doubt, stick to basic techniques

### Prevention Tips
- Master basic techniques before learning advanced ones
- Practice specific techniques in isolation
- Use puzzle books that teach techniques progressively
- Join online communities to learn from others

## Mistake #6: Rushing Through Easy Puzzles

### The Problem
Overconfidence with easy puzzles leads to careless errors that waste time fixing.

### The Solution
- Maintain consistent checking habits regardless of difficulty
- Treat every puzzle with the same systematic approach
- Speed will come naturally—don't force it
- Build good habits on easy puzzles for hard ones

### Prevention Tips
- Focus on accuracy, not speed
- Use easy puzzles to perfect your technique
- Time yourself for improvement tracking, not competition
- Celebrate error-free completion over fast completion

## Mistake #7: Poor Pencil Mark Management

### The Problem
Writing pencil marks too large, too messy, or including too many candidates makes the puzzle harder to read and increases errors.

### The Solution
- Write small, neat pencil marks
- Use a consistent position for each number (1 in top-left, 2 in top-center, etc.)
- Only mark candidates when necessary
- Erase updated marks clearly

### Prevention Tips
- Develop a standard notation system
- Practice neat handwriting for marks
- Consider using a fine-point pencil
- Or use digital Sudoku for automatic candidate management

## Mistake #8: Not Learning from Mistakes

### The Problem
Making the same errors repeatedly without analyzing why they happen.

### The Solution
- When you make a mistake, understand what caused it
- Keep a log of common errors
- Practice the specific skill that led to the mistake
- Develop personalized strategies to prevent repeat errors

### Prevention Tips
- Review completed puzzles for mistakes
- Identify patterns in your errors
- Create personal checkpoints for your weak areas
- Practice deliberately, focusing on improvement

## Mistake #9: Skipping Basic Scanning

### The Problem
Jumping to advanced techniques before exhausting all basic possibilities.

### The Solution
- Always perform a complete basic scan before using advanced techniques
- Check for naked singles and hidden singles thoroughly
- Verify you haven't missed obvious moves
- Remember: basics solve most puzzles

### Prevention Tips
- Develop a mandatory scanning routine
- Create a mental checklist of basic techniques
- Force yourself to find all basic moves first
- Advanced techniques should be a last resort

## Mistake #10: Playing When Tired or Distracted

### The Problem
Mental fatigue and distractions significantly increase error rates and decrease enjoyment.

### The Solution
- Play when you're alert and focused
- Take breaks during long solving sessions
- Create a distraction-free environment
- Stop if you're making frequent mistakes

### Prevention Tips
- Schedule Sudoku time when you're most alert
- Use puzzles as a mental warm-up, not a wind-down
- Minimize environmental distractions
- Listen to your mental state

## Building Better Habits

Avoiding mistakes isn't about perfection—it's about developing systematic approaches that minimize errors:

1. **Create a Routine**: Develop consistent checking and verification habits
2. **Practice Mindfulness**: Stay present and focused while solving
3. **Learn Progressively**: Master one skill before moving to the next
4. **Review and Reflect**: Analyze both successes and failures
5. **Be Patient**: Skill development takes time

## Conclusion

Everyone makes mistakes while learning Sudoku. The difference between beginners and experts isn't that experts never make mistakes—it's that they've learned to recognize and prevent them. Use this guide as a reference when you notice errors in your solving. Over time, these preventive measures will become automatic, and you'll find yourself solving faster with fewer mistakes.

Remember: Every mistake is a learning opportunity. Embrace them as part of your journey to mastery, and you'll become a better solver much faster than if you simply got frustrated and gave up.
    `
  },
  'speed-solving': {
    title: 'Speed Solving Techniques for Sudoku',
    description: 'Learn how to solve Sudoku puzzles faster without sacrificing accuracy. Expert speed solving tips and techniques.',
    keywords: 'sudoku speed solving, solve sudoku faster, sudoku time reduction, competitive sudoku 2025',
    content: `
# Speed Solving Techniques for Sudoku

## Introduction to Speed Solving

Speed solving Sudoku isn't just about moving faster—it's about efficiency, pattern recognition, and optimized technique. This guide will teach you how to solve puzzles quickly while maintaining accuracy.

## The Foundation: Accuracy First

Before pursuing speed, you must be accurate. Fast solving means nothing if you make mistakes that require backtracking. Build a solid foundation:

1. Master all basic techniques completely
2. Develop consistent checking habits
3. Achieve 100% accuracy on your current difficulty level
4. Only then focus on speed improvement

## Principle #1: Optimize Your Scanning Pattern

### Efficient Scanning
Develop a systematic pattern for scanning the puzzle:

1. **Box-by-Box Scanning**: Start with box 1, move to box 2, etc.
2. **Number-by-Number**: Scan for where each number (1-9) can go
3. **Row-Column Alternation**: Switch between row and column scanning

### The Priority System
Train yourself to spot the easiest solves first:
- Naked singles (highest priority)
- Hidden singles in boxes
- Hidden singles in rows/columns
- More complex patterns

### Practice Exercise
Time yourself scanning for all naked singles in a puzzle. Repeat until you can find them all in under 30 seconds.

## Principle #2: Minimize Physical Movement

### Efficient Writing
- Use abbreviations or dots for pencil marks
- Develop fast, consistent notation
- Minimize erasing by being accurate
- Consider digital solving for speed

### Strategic Eye Movement
- Train peripheral vision to see more at once
- Reduce the number of times you scan the same area
- Learn to check row, column, and box simultaneously

### Reduce Tool Switching
- Minimize switching between pencil and eraser
- Use digital tools that auto-update candidates
- Develop memory for short-term candidate tracking

## Principle #3: Pattern Recognition

### Building Mental Libraries
Speed comes from instantly recognizing patterns rather than analyzing from scratch each time.

### Common Patterns to Memorize
1. **Box-Line Interactions**: Where a number in a box forces elimination in a row/column
2. **Pointing Pairs/Triples**: Candidates in a box that point to a specific row/column
3. **Naked/Hidden Pairs**: Two cells with identical candidates (or hidden in a row/column/box)
4. **Common X-Wing Positions**: Typical places where X-Wings appear

### Training Pattern Recognition
- Solve 10-20 puzzles at the same difficulty level
- Note recurring patterns
- Practice identifying patterns outside of solving
- Use pattern-specific training puzzles

## Principle #4: Strategic Pencil Mark Usage

### When to Use Pencil Marks
- **Don't** mark candidates when the puzzle has many empty cells
- **Do** mark candidates when you're stuck or the puzzle is complex
- **Selective Marking**: Only mark candidates in strategic cells

### Efficient Marking System
1. Only mark cells with 2-3 candidates
2. Use a position-based system (1=top-left, 9=bottom-right)
3. Update marks immediately when placing numbers
4. Clear marks that are no longer useful

### Speed Marking Technique
Instead of marking all candidates, mark only the most constrained cells or cells you're actively working on.

## Principle #5: Mental vs. Written Solving

### Developing Mental Solving Skills
Expert speed solvers do much of the work mentally:

1. Track simple candidates mentally
2. Hold temporary hypotheses in working memory
3. Calculate eliminations without writing
4. Only write definite answers

### Progressive Mental Training
- Start by solving easy puzzles entirely mentally
- Gradually increase difficulty as your mental capacity grows
- Use written marks as backup, not primary tool
- Practice memory exercises outside of Sudoku

## Principle #6: Technique Selection Speed

### Quick Technique Assessment
Learn to quickly identify which technique to apply:

1. **0-5 seconds**: Scan for naked singles
2. **5-10 seconds**: Check for hidden singles
3. **10-20 seconds**: Look for basic patterns
4. **20+ seconds**: Consider advanced techniques

### The Decision Tree
Develop a mental decision tree:
- Always check simplest techniques first
- Move to complex techniques only when necessary
- Know when to move on vs. persist with a technique

## Principle #7: Strategic Breaks and Focus

### Optimal Focus Duration
- Most people solve fastest in 15-25 minute sessions
- Take 5-minute breaks between puzzles
- Don't push through fatigue—it slows you down

### The Flow State
Achieve optimal solving speed by entering "flow":
- Eliminate distractions completely
- Warm up with easier puzzles
- Find your optimal challenge level
- Maintain steady, rhythmic solving

## Advanced Speed Techniques

### Bifurcation (Use Sparingly)
When truly stuck on hard puzzles:
1. Identify a cell with two candidates
2. Mentally test one option for a few moves
3. If it leads to obvious contradiction, choose the other
4. Use only as a last resort—it's error-prone at speed

### Parallel Processing
Work on multiple areas simultaneously:
- While waiting for a mental calculation, scan another area
- Fill in multiple obvious numbers in sequence
- Return to complex areas with fresh perspective

### Chain Recognition
Learn to see cause-and-effect chains quickly:
- If A is true, then B must be true, then C...
- Practice chain visualization
- Speed comes from seeing chains instantly

## Training for Speed

### Progressive Speed Training

**Week 1-2: Accuracy Baseline**
- Solve 5 puzzles daily at your comfortable difficulty
- Track accuracy (must be 100%)
- Note common error patterns

**Week 3-4: Basic Speed**
- Time yourself on each puzzle
- Try to beat your previous best time
- Maintain 100% accuracy

**Week 5-6: Pattern Recognition**
- Focus on recognizing patterns faster
- Use pattern-specific training puzzles
- Reduce thinking time per move

**Week 7-8: Advanced Speed**
- Practice mental solving
- Minimize pencil mark usage
- Optimize scanning patterns

### Daily Speed Practice Routine

**Morning (15 minutes)**
- One easy puzzle as fast as possible
- One medium puzzle focusing on technique

**Evening (15 minutes)**
- One challenging puzzle
- Review and identify what slowed you down

### Measurement and Goals

Track these metrics:
1. **Average Time**: For each difficulty level
2. **Best Time**: Personal records
3. **Accuracy**: Error rate per puzzle
4. **Technique Distribution**: Which techniques you use most

Set progressive goals:
- Reduce average time by 10% each month
- Maintain 95%+ accuracy
- Gradually increase difficulty level

## Common Speed Pitfalls

### Mistake #1: Sacrificing Accuracy
Speed without accuracy is counterproductive. Errors cost more time than slow, careful solving.

### Mistake #2: Skipping Basics
Never skip basic scans to jump to complex techniques—basics are faster.

### Mistake #3: Inconsistent Practice
Speed improves with daily practice. Sporadic solving won't build the neural pathways needed for speed.

### Mistake #4: Comparing to Others
Everyone has different natural speeds. Compete with yourself, not others.

## Advanced Speed Solving Mindset

### Mental Preparation
- Believe you can solve quickly
- Stay calm under time pressure
- Embrace mistakes as learning opportunities
- Visualize successful fast solving

### Physical Optimization
- Ensure good lighting
- Maintain comfortable posture
- Stay hydrated
- Solve when you're most alert

## Competitive Speed Solving

### Tournament Preparation
If you're interested in competitive Sudoku:

1. Practice under time pressure regularly
2. Learn to manage competition stress
3. Develop time management strategies
4. Study puzzles from past competitions

### Time Management in Competition
- Assess puzzle difficulty quickly
- Allocate time accordingly
- Know when to move on from a stuck puzzle
- Keep a steady pace rather than rushing

## Conclusion

Speed solving is a gradual process that rewards consistent practice and smart training. The key principles are:

1. **Accuracy is foundational** - Never sacrifice it for speed
2. **Pattern recognition** - Speed comes from instantly seeing patterns
3. **Efficient technique** - Optimize every aspect of your solving process
4. **Progressive training** - Improve gradually with focused practice
5. **Mental game** - Develop focus, confidence, and optimal mindset

Remember: Current world record holders took years to reach their speed. Compare yourself to your yesterday self, not to experts. With dedicated practice, you'll see dramatic improvements in your solving speed while maintaining the joy of the puzzle.

Start implementing one technique from this guide today. Master it, then add another. Over time, these optimizations compound into significant speed gains. Happy fast solving!
    `
  },
  'mental-strategies': {
    title: 'Mental Strategies for Sudoku Success',
    description: 'Develop the right mindset and cognitive approach for Sudoku. Learn focus techniques, memory strategies, and mental resilience.',
    keywords: 'sudoku mental strategies, sudoku mindset, focus techniques sudoku, cognitive strategies puzzle solving 2025',
    content: `
# Mental Strategies for Sudoku Success

## The Psychology of Puzzle Solving

Sudoku is as much a mental game as it is a logical one. Your mindset, focus, and cognitive strategies directly impact your solving ability and enjoyment. This guide explores the psychological aspects that separate good solvers from great ones.

## Building a Growth Mindset

### Fixed vs. Growth Mindset

**Fixed Mindset**: "I'm either good at Sudoku or I'm not"
- Avoids challenges
- Gives up easily
- Views mistakes as failures
- Feels threatened by others' success

**Growth Mindset**: "I can improve at Sudoku with practice"
- Embraces challenges
- Persists through difficulties
- Views mistakes as learning opportunities
- Finds inspiration in others' success

### Cultivating Growth

1. **Reframe Challenges**: "This is hard" becomes "This is making me better"
2. **Celebrate Process**: "I used a new technique today" over "I solved it fast"
3. **Embrace Mistakes**: Each error teaches something valuable
4. **Track Progress**: Document improvement over time

## The Power of Focus

### Deep Focus Techniques

#### The Pomodoro Approach
- Solve for 25 minutes with complete focus
- Take 5-minute breaks
- Resume for another session
- Notice improved solving quality

#### Environmental Optimization
- Eliminate distractions (phone, TV, background chaos)
- Create a dedicated puzzle-solving space
- Use ambient noise or silence, not distracting music
- Ensure proper lighting and comfort

#### Pre-Solving Ritual
Develop a routine that signals your brain it's puzzle time:
1. Clear your workspace
2. Take three deep breaths
3. Quick neck and shoulder stretch
4. Begin with intention and focus

### Maintaining Concentration

**The Wandering Mind**
When you notice your mind wandering:
1. Pause solving immediately
2. Acknowledge the distraction without judgment
3. Take three focused breaths
4. Return to the puzzle with renewed attention

**Progressive Focus Training**
- Week 1: Solve for 10 minutes without distraction
- Week 2: Extend to 15 minutes
- Week 3: Reach 25-30 minutes
- Build your focus capacity gradually

## Memory Strategies

### Working Memory Enhancement

#### Chunking Information
Instead of remembering "cell R5C3 can be 2 or 7":
- Group related information
- Visualize patterns rather than individual facts
- Use spatial memory ("top box needs 2 or 7")

#### The 7±2 Rule
Working memory holds 5-9 items. To work within this:
- Focus on one section at a time
- Write down complex chains
- Don't try to hold too much mentally

### Pattern Memory

#### Building Mental Templates
As you solve more puzzles, build a library of patterns:
- Common number placements
- Typical technique applications
- Recurring logical chains

#### Retrieval Practice
- Regularly recall patterns without looking
- Test yourself on technique identification
- Review solved puzzles to reinforce memory

## Emotional Regulation

### Managing Frustration

#### The Stuck Response
When you hit a wall:

**Poor Response**: Force solutions, guess, get angry, give up

**Better Response**:
1. Recognize you're stuck without judgment
2. Take a 2-minute break
3. Return with fresh perspective
4. Try a different approach or area

#### The Error Response
When you make a mistake:

**Poor Response**: Self-criticism, frustration, loss of confidence

**Better Response**:
1. Acknowledge the error calmly
2. Understand what caused it
3. Learn the specific lesson
4. Move forward without dwelling

### Building Resilience

#### Stress Inoculation
Gradually expose yourself to challenging puzzles:
- Build confidence with achievable challenges
- Slowly increase difficulty
- Develop tolerance for uncertainty
- Celebrate progress, not just completion

#### Positive Self-Talk
Replace negative thoughts:
- "I can't do this" → "I haven't found the solution yet"
- "This is too hard" → "This is developing my skills"
- "I'm terrible at Sudoku" → "I'm learning and improving"

## Cognitive Strategies

### Pattern Recognition Training

#### Visual Processing
- Spend time just looking at puzzles without solving
- Identify patterns before making moves
- Train your brain to see relationships quickly

#### Spatial Reasoning
Improve your spatial awareness:
- Visualize how numbers interact across the grid
- Practice seeing rows, columns, and boxes simultaneously
- Develop 3D thinking (seeing the puzzle as interconnected layers)

### Logical Thinking Development

#### Deductive Reasoning
- Always move from evidence to conclusion
- Avoid assumptions or leaps
- Check each logical step
- Build chains of reasoning methodically

#### Strategic Planning
Before solving:
1. Assess puzzle difficulty
2. Plan which techniques to try first
3. Identify promising areas to start
4. Set realistic time expectations

## The Flow State

### Achieving Flow in Sudoku

Flow is the optimal mental state where challenge meets skill:

**Conditions for Flow**
1. Clear goals (solve the puzzle)
2. Immediate feedback (right or wrong placements)
3. Balance between skill and challenge
4. Complete focus on the task

**How to Enter Flow**
- Choose appropriate difficulty level
- Eliminate all distractions
- Start with a warm-up puzzle
- Let go of time pressure
- Trust your trained instincts

### Maintaining Flow

Once in flow:
- Don't check the time
- Ignore external thoughts
- Trust your intuition
- Stay present with each move

## Mindfulness in Solving

### Present-Moment Awareness

#### The Mindful Solver
- Notice each number placement
- Feel the satisfaction of logical deduction
- Stay aware of your thought process
- Accept uncertainty without anxiety

#### Meditation Practice
Regular meditation improves Sudoku performance:
- 10 minutes daily mindfulness meditation
- Focus on breath awareness
- Build concentration capacity
- Reduce mental chatter

### Managing Mental Fatigue

#### Recognizing Fatigue Signs
- Decreased concentration
- Increased errors
- Frustration rising
- Solving feels like work, not fun

#### Recovery Strategies
- Take immediate breaks
- Do physical activity
- Hydrate and eat if needed
- Return when refreshed

## Motivation and Consistency

### Intrinsic vs. Extrinsic Motivation

#### Intrinsic (Better for Long-term)
- Enjoyment of the solving process
- Satisfaction of logical discovery
- Love of mental challenge
- Personal growth and mastery

#### Extrinsic (Less Sustainable)
- Impressing others
- Winning competitions
- External rewards
- Social status

### Building Consistent Practice

#### The Habit Loop
**Cue**: Morning coffee
**Routine**: Solve one Sudoku puzzle
**Reward**: Satisfaction and mental clarity

#### Sustainable Practice
- Start with 10 minutes daily
- Make it enjoyable, not obligatory
- Track progress for motivation
- Join a community for accountability

## Social and Comparative Psychology

### Healthy Competition

#### With Yourself
- Track personal bests
- Celebrate improvements
- Note skill development
- Set progressive goals

#### With Others
- Use competition for motivation, not validation
- Learn from faster solvers
- Share techniques with community
- Appreciate different solving styles

### Overcoming Comparison Trap

**Remember:**
- Everyone has different starting points
- Natural aptitudes vary
- Consistent practice beats natural talent
- Your journey is unique and valuable

## Mental Health Benefits

### Why This Matters

Regular Sudoku practice provides:
1. **Cognitive Exercise**: Keeps your brain sharp
2. **Stress Relief**: Meditative focus reduces anxiety
3. **Accomplishment**: Regular small wins boost confidence
4. **Mindfulness**: Present-moment focus
5. **Resilience**: Building frustration tolerance

### Balanced Approach

Sudoku should enhance life, not dominate it:
- Set time limits on sessions
- Maintain diverse activities
- Don't let it become obsessive
- Keep perspective—it's recreation, not life-or-death

## Practical Mental Training Program

### Week 1-2: Foundation
- Establish daily 15-minute practice
- Focus on present-moment awareness
- Notice and reduce distractions
- Begin tracking progress

### Week 3-4: Focus Development
- Practice pre-solving ritual
- Extend focus time to 25 minutes
- Work on one puzzle without breaks
- Develop error management routine

### Week 5-6: Pattern Recognition
- Study solved puzzles for patterns
- Practice visualization exercises
- Work on memory techniques
- Build mental template library

### Week 7-8: Flow and Integration
- Pursue flow state experiences
- Balance challenge and skill
- Reflect on mental progress
- Develop personalized strategies

## Advanced Mental Techniques

### Visualization

Practice seeing the completed puzzle:
- Imagine numbers in empty cells
- Visualize logical chains
- Picture pattern completions
- Develop stronger intuition

### Intuition Development

Trust trained intuition:
- Make note of first impressions
- Check if intuition was correct
- Build confidence in pattern recognition
- Balance intuition with verification

### Meta-Cognition

Think about your thinking:
- What strategies do you favor?
- When do you make mistakes?
- How does your mood affect solving?
- What conditions optimize your performance?

## Conclusion

Mental strategies are the hidden advantage in Sudoku. Two solvers with equal technical knowledge will perform very differently based on mindset, focus, and emotional regulation.

**Key Takeaways:**
1. Mindset shapes ability—adopt growth perspective
2. Focus is trainable—practice concentration daily
3. Emotions impact performance—learn regulation
4. Pattern recognition improves with mindful practice
5. Flow state enhances both enjoyment and speed
6. Consistency trumps intensity

The mental game in Sudoku extends far beyond the puzzle itself. The concentration, resilience, and logical thinking you develop transfer to many life areas. Approach each puzzle as an opportunity for mental training, not just entertainment.

Start with one mental strategy from this guide. Perhaps it's the pre-solving ritual, or mindful awareness during solving, or better error management. Master it, then add another. Over time, you'll develop a powerful mental approach that makes Sudoku more enjoyable and your solving more effective.

Remember: The puzzle is your training ground. The real victory is the mental strength you build along the way.
    `
  }
};

export async function generateMetadata(
  { params }: { params: { slug: string } }
): Promise<Metadata> {
  const tutorial = tutorials[params.slug];

  if (!tutorial) {
    return {
      title: 'Tutorial Not Found',
    };
  }

  return {
    title: tutorial.title,
    description: tutorial.description,
    keywords: tutorial.keywords,
  };
}

export default function TutorialPage({ params }: { params: { slug: string } }) {
  const tutorial = tutorials[params.slug];

  if (!tutorial) {
    notFound();
  }

  const sections = tutorial.content
    .split('\n## ')
    .filter(section => section.trim())
    .map(section => {
      const lines = section.split('\n');
      const heading = lines[0].replace('# ', '');
      const content = lines.slice(1).join('\n');
      return { heading, content };
    });

  return (
    <div className="min-h-screen bg-gray-50 py-12 px-4">
      <div className="max-w-4xl mx-auto">
        <Link
          href="/tutorials"
          className="inline-flex items-center gap-2 text-blue-600 hover:text-blue-700 mb-6 font-medium"
        >
          <ArrowLeft size={20} />
          Back to Tutorials
        </Link>

        <article className="bg-white rounded-lg shadow-lg p-8 md:p-12">
          <h1 className="text-4xl md:text-5xl font-bold text-gray-900 mb-6">
            {tutorial.title}
          </h1>
          <p className="text-xl text-gray-600 mb-8 border-l-4 border-blue-500 pl-4">
            {tutorial.description}
          </p>

          <div className="prose prose-lg max-w-none">
            {sections.map((section, index) => (
              <div key={index} className="mb-8">
                <h2 className="text-2xl font-bold text-gray-900 mb-4">
                  {section.heading}
                </h2>
                <div className="text-gray-700 whitespace-pre-line leading-relaxed">
                  {section.content}
                </div>
              </div>
            ))}
          </div>

          <div className="mt-12 p-6 bg-blue-50 rounded-lg border-l-4 border-blue-500">
            <h3 className="text-xl font-bold text-gray-900 mb-2">
              Ready to Practice?
            </h3>
            <p className="text-gray-700 mb-4">
              Apply what you've learned with our interactive Sudoku puzzles.
            </p>
            <Link
              href="/play"
              className="inline-block bg-blue-600 text-white px-6 py-3 rounded-lg font-semibold hover:bg-blue-700 transition-colors"
            >
              Play Now
            </Link>
          </div>
        </article>
      </div>
    </div>
  );
}

export function generateStaticParams() {
  return Object.keys(tutorials).map((slug) => ({
    slug,
  }));
}
